The GM1227-3 is a side fired kiln, which means you can fuse or slump on multiple levels. Depending on your projects, you can fire up to 4 layers of similar projects which basically quadruples your firing capacity. Zone Control is standard on this model so temperatures stay uniform top to bottom. Specifications - Max Temp: 1800 F ; Amps: 48A/240V; Phase: 1; Watts: 11520; NEMA Receptacle:6-50; Wire Size: 6; Opening: 28"x 28"; Depth: 27"; Cubic Feet: 9.9; Weight: 380 lbs.